https://devzone.nordicsemi.com/f/nordic-q-a/102854/should-nrf9160-be-powered-during-swd-programmingOn our custom board with the nRF9160, we are supplying different voltages to VDD (from a single-cell Lipo) and to VDD_GPIO (fixed 1.8V). We plan to use an nRF9160DK as the programmer. During programming, should both VDD and VDD_GPIO be supplied? Anden-USTelligent Community 13Tue, 15 Aug 2023 08:38:05 GMThttps://devzone.nordicsemi.com/thread/441312?ContentTypeID=1Tue, 15 Aug 2023 08:38:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fc81c106-19ca-414e-bbac-1d41553dfd8fallard.p<p>The VDD pin provides the reference voltage for the I/O of the programmer. This makes the JLink compatible with 1V8/3V3/5V targets.</p><div style="clear:both;"></div>